For the vanilla sponge cake: Beat the 5 large eggs with 125g sugar until light and fluffy. Fold in 175g all-purpose flour and a pinch of vanilla.
For the lemon cream: Combine 1.5 cups fresh lemon juice, 1 cup granulated sugar, 1 cup water, and 1.5 tbsp cornstarch in a saucepan. Cook while stirring constantly until the mixture thickens. Remove from heat, strain to remove the lemon zest, and let cool completely.
For the filling cream: Beat 250g unsalted cream cheese and 250g whipping cream until smooth and creamy.
